This property, which adjoins the Mt. Nansen property on the north side, is bisected by Discovery Creek, a significant placer gold producer. Two parallel zones of anastomosing quartz veins and porphyry dykes cut Cretaceous intrusive rocks and contain variable amounts of gold and silver over substantial widths. The two mineralized zones lie approximately on trend with the Brown-McDade and Webber-Huestis zones on the Mt. Nansen property to the south, and with gold and silver-bering veins on the Tawa property to the north. The mineralized zones are deeply oxidized, and the property appears to have good potential as a bulk tonnage low-grade oxide gold deposit.

not_specified

Surficial geological map (1:50,000 scale) of Mount Haldane area, central Yukon (NTS 105M/13) including marginal notes on physiography, glacial history, placer gold potential and terrain hazards.

not_specified

not_specified

The northeast Anvil area, 15 km north of Mount Mye (NTS 105K/6, 105K/7), is underlain by a conformable Cambrian-Devonian volcanic and sedimentary package with an aggregate thickness of greater than 1600 m. The lowest unit, with an exposed thickness of 120 m, consists of calcareous phyllites of the Cambrian-Ordovician Vangorda formation. Conformably overlying the phyllites is a >900-m-thick Ordovician-Silurian sequence of submarine basalt flows and volcaniclastic sedimentary rocks of the Menzie Creek formation. Volcaniclastic sediments are dominantly coarse, proximal, fragmental breccias with lesser conglomerates, sandstones, and siltstones. Carbonaceous shales with lesser siltstones, limestones, dolostones, and quartzites of the Ordovician-Devonian Road River Group (>450 m) are intercalated with and overlying the basalt flows. The east margin of the map area is a depositional edge of basalt volcanism with only scattered thin flows occurring further to the east. This depositional edge is considered to be a north-trending, west-side-down, Ordovician-Silurian syndepositional, normal fault forming the east margin of a sedimentary sub-basin infilled with volcanic rocks. Hornfelsing on the east margin of the map area indicates a large, shallowly buried, northwest extension of the mid-Cretaceous Orchay Batholith.

Galena and pyrrhotite occur in manganese-stained quartz-carbonate breccia beneath rusty limestone. Surface geology of the area suggests that the mineralization is a replacement of brecciated limestone in the footwall of a low-angle fault. Results from previous exploration have proved disappointing but the host structure is probably regional in extent and larger deposits may exist along strike.

not_specified

not_specified

The Mount Freegold district is an ideal natural laboratory to evaluate the structural and magmatic framework for porphyry, skarn and epithermal mineralization in the Dawson Range. The district is located within a major extensional relay zone of the Big Creek fault system, a regionally significant dextral strike-slip structure in which localized extension facilitated the emplacement of mid to Late Cretaceous magmatic rocks. New mapping defines a previously unrecognized granite pluton at Mount Freegold, as well as the ca. 77 Ma Stoddart pluton, which represents the magmatic roots of hypabyssal intrusive rocks at the Revenue Cu-Mo-Au-Ag deposit and Nucleus Au-Ag-Cu deposit. The relay zone in the Big Creek fault system is partly plugged by the ca. 70 Ma Seymour Creek stock, which is cut by a southern strand of the fault system. Episodic fault movement took place over a minimum 35 m.y. interval during which at least three distinct epochs of magmatic-hydrothermal mineralization occurred.